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At the beginning of Act 4, what is Shakespeare's purpose in having Othello fall into a trance when Iago tells him that Cassio did lie "with her, on her, what you will"?
It provides a setting which will allow for Othello to be hospitalized.
It will let Desdemona see Othello as a weak character.
It shows the Renaissance belief that physical and mental health parallel each other. Othello's physical ailment implies that he has also become mentally ill.
It shows that Iago's evil character has transcended to Othello and is manifesting through his physical ailment.
It shows that Othello is so weak that he feigns illness to stop listening to Iago talk about Desdemona and Cassio's affair.